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include/partition_table.inc

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+;    Copyright (C) 2020  Bradley Claus
+;
+;    This program is free software: you can redistribute it and/or modify
+;    it under the terms of the GNU General Public License as published by
+;    the Free Software Foundation, either version 3 of the License, or
+;    (at your option) any later version.
+;
+;    This program is distributed in the hope that it will be useful,
+;    but WITHOUT ANY WARRANTY; without even the implied warranty of
+;    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+;    GNU General Public License for more details.
+;
+;    You should have received a copy of the GNU General Public License
+;    along with this program.  If not, see <https://www.gnu.org/licenses/>.
+
+
+; Partition table entry format
+; Off.  Size.       Description
+;0x00 	  1 	Drive attributes (bit 7 set = active or bootable)
+;0x01 	  3 	CHS Address of partition start
+;0x04 	  1 	Partition type
+;0x05 	  3 	CHS address of last partition sector
+;0x08 	  4 	LBA of partition start
+;0x0C 	  4 	Number of sectors in partition 
+
+struc PartEntry_t
+    .attributes resb 1
+    .chs_start  resb 3
+    .part_type  resb 1
+    .chs_end    resb 3
+    .lba_start  resb 4
+    .lba_length resb 4
+endstruc
+
+struc PartTable_t
+    .partition1 resb 16
+    .partition2 resb 16
+    .partition3 resb 16
+    .partition4 resb 16
+endstruc
+
+
+;Offset	Size	    Description
+; 0	    1	    size of packet (16 bytes)
+; 1	    1	    always 0
+; 2	    2	    number of sectors to transfer (max 127 on some BIOSes)
+; 4	    4	    transfer buffer (0xFFFF:0xFFFF)
+; 8	    4	    lower 32-bits of starting 48-bit LBA
+; 12	4	    upper 32-bits of starting 48-bit LBA
+; needs to be aligned to a uint32_t
+struc LBAPkt_t
+    .size        resb 1
+    .res0        resb 1
+    .xfer_size   resw 1
+    .offset      resw 1
+    .segment     resw 1
+    .lower_lba   resd 1
+    .upper_lba   resd 1
+endstruc